<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
   <!-- <title>子页面</title> -->
    <script src="event.js"></script>

</head>
<body onload="onLoad()">
<h1>hello world</h1>
<label id="data"></label>
<p/>
<button onclick="closeWindow()">关闭窗口</button>
</body>
</html>